Author Topic: Delta II - (ICESat)-2 - 2018  (Read 11399 times)

Offline edkyle99

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Re: Delta II - (ICESat)-2 - July, 2016
« Reply #20 on: 12/11/2015 01:01 AM »
Not to sound incredulous, but that's all of the modern Delta second stage failures? Wow!

Add in the Delta IV USA-239 (GPS IIF-3) RL-10 breach and that's really not many upper stage failures at all.

Of course the last Delta II failure of any kind that I can recall was in 1997... it has been quite a while.
These were the most recent second stage failures.  There were, of course, other second stage failures before 1974.  Delta 96 in 1973.  Delta 86 in 1971.  Delta 1 in 1960 (a control system failure).  Stage 3 failures occurred in 1964 (Delta 24) and 1965 (Delta 33), and twice in 1969 (Deltas 71 and 73).  Flight control failures during the first stage of flight occurred in 1968 (Delta 59), 1986 (Delta 178), and 1998 (Delta 259, the first Delta 3).  Deltas 134 (1977), 228 (1995) and 241 (1997) suffered SRM failures (Delta 228 had an SRM fail to jettison, the others had ruptured SRMs).

Thor-derived Deltas have flown 342 times and failed only 16 times.  If you include Japan's N1, N2, H1 "Deltas" the numbers are 368 flights and 17 failures.  These numbers include the three Delta 3 flights with their two failures.

 - Ed Kyle
« Last Edit: 12/11/2015 01:09 AM by edkyle99 »

Offline woods170

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Re: Delta II - (ICESat)-2 - July, 2016
« Reply #21 on: 03/08/2017 08:58 AM »
BUMP

For what it's worth: the launch of ICESAT-2, on the final Delta II, is planned for 2018. Hence, modification of the thread title is needed.
« Last Edit: 03/08/2017 09:02 AM by woods170 »

Offline Steven Pietrobon

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Re: Delta II - (ICESat)-2 - July, 2016
« Reply #22 on: 03/08/2017 09:13 AM »
Launch date is June 2018 according to

http://spacenews.com/41729paying-for-icesat-2-overruns-delays-international-earth-science-launches/

That information is from September 2014 though! The Facebook page says 2018, which confirms the year.

https://www.facebook.com/ICESat2/
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Proponent

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Re: Delta II - (ICESat)-2 - 2018
« Reply #23 on: 03/08/2017 12:56 PM »
Not to sound incredulous, but that's all of the modern Delta second stage failures? Wow!

Add in the Delta IV USA-239 (GPS IIF-3) RL-10 breach and that's really not many upper stage failures at all.

Of course the last Delta II failure of any kind that I can recall was in 1997... it has been quite a while.

Delta II has very good track record.  But given that the flight rate is now measured not in launches per year but in years between launches, I wonder if next year's ICESat launch is not a bit risky.  Being the very last Delta II mission ever won't help either.

Offline rcaron

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Re: Delta II - (ICESat)-2 - 2018
« Reply #24 on: 03/08/2017 07:57 PM »
Launch date is June 2018 according to

http://spacenews.com/41729paying-for-icesat-2-overruns-delays-international-earth-science-launches/

That information is from September 2014 though! The Facebook page says 2018, which confirms the year.

https://www.facebook.com/ICESat2/
I think June is bogus. How can a 2014 article specify a 2018 launch, when 2017 was being tracked up to last fall?

Offline woods170

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Re: Delta II - (ICESat)-2 - 2018
« Reply #25 on: 03/09/2017 07:43 AM »
Launch date is June 2018 according to

http://spacenews.com/41729paying-for-icesat-2-overruns-delays-international-earth-science-launches/

That information is from September 2014 though! The Facebook page says 2018, which confirms the year.

https://www.facebook.com/ICESat2/
I think June is bogus. How can a 2014 article specify a 2018 launch, when 2017 was being tracked up to last fall?

This NASA site says 2018: https://www.nasa.gov/content/goddard/icesat-2
Quote
About ICESat-2

ICESat-2 (short for Ice, Cloud and land Elevation Satellite), slated to launch in 2018, will use lasers and a very precise detection instrument to measure the elevation of Earth’s surface. By timing how long it takes laser beams to travel from the satellite to Earth and back, scientists can calculate the height of glaciers, sea ice, forests, lakes and more – including the changing ice sheets of Greenland and Antarctica.

That page was updated August 23, 2016. So, tracking a launch in 2018 since last fall.
« Last Edit: 03/09/2017 07:46 AM by woods170 »

Offline rcaron

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Re: Delta II - (ICESat)-2 - 2018
« Reply #26 on: 06/01/2017 07:00 PM »
It looks like September after all. https://www.nasa.gov/content/upcoming-elana-cubesat-launches (page last updated 4/18/17) shows NET September 12, 2018 (ELaNa-XVIII)

https://www.grss-ieee.org/wp-content/uploads/2017/03/Prospectus_ICESat2_Atmospheric_Tutorial.pdf also mentions September (document dated 3/16/17)

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